云南金沙江流域华山松人工林水土保持效益研究

以裸地为对照 ,对云南金沙江流域的华山松人工林林地的土壤物理性状及营养成分、林分涵养水源的能力、林冠层降雨截流功能、土壤水分动态变化、土壤渗透能力、林地地表径流及泥沙量以及地表生物量和根系分布状况进行了定点、定量观测研究。结果表明 :华山松林对改良土壤、增加肥力具有明显的作用 ,与裸地相比 ,其林地有机质、土壤月均含水率、渗透性能分别是裸地的 2 74、 1 14、 4 6 1倍 ,土壤最大蓄水量比裸地高5 6 74 % ;华山松林分年降雨截流量为 6 3 7mm ,截流率为 2 0 2 % ,径流率为 5 7%。径流削减率为 91 3% ,泥沙削减率为 95 6 % ;土层 2 0cm之上根系占总量的 83% ,对地面固土保水起着重要的作用

Soil and Water Conservation Benefits of Man-made Pinus armandi Forest in Jinshajiang Watershed of Yunnan

Taking bare land as control,the physical properties,nutrient,water holding capacity of the soil,water interception of crown canopy,dynamics of soil water,permeability,surface runoff,silt,aboveground biomass and root distribution of man made Pinus armandi forest land at Toutang small watershed,Huize Yunnan were observed and examined quantificationally The results implied that man made P armandi forest could improve soil and increase the soil fertility significantly The content of organic matter,water content and permeability were 2 74,1 14 and 4 61 times of that of bare land The biggest water conservation amount was 56 74% higher than control The annual interception of rain fall,interception ratio,runoff ratio,runoff minify ratio silt and sand minify ratio of man made P armandi forest were 63 7mm,20 2%,5 7%,91 3%,95 6% respectively The root system within 20cm under soil surface was 83% of the total,which played an important role in fixing soil and conserving water